Melting apparatus



@W y Q HHH igf/ffmw F. F. SCHRODER.

MELTING APPARATUS. v

FILEDJUNE30.1919.

Dec., 26, 1922;

FRED. SGT-IRODER, OF CHCAGQ. ILLNOIS, ASSIGNOR TO HENRY G. SML, 0F

enrol-icc,

MIELTNG PPARATUS.

Application filed .Tune 30,

To all w from may coa-cern f Be it known that l, FRED. l?. SGHRODER,citizen of the lnited States, residing` at Chicago, in the county ofCook and State of llllinois, have invented a certain new and usefulimprovement in Melting Apparatus, of' which the following is a full7clear, concise, and exact description.

My invention relates to melting pots and receivers for holding moltenmaterial received from the melting pots.

in accordance with one feature of my invention the melting pot istapered toward its bottom instead of having the bottom in angularrelation to the sides of the melting pot whereby the material beingmelted. is not free to linger in any part of the melting pot when themelted material is withdrawn therefrom. rihe melting pot of my inventiontherefore enables me to maintain all of the material in the melting potat substantially uniform temperature and homogeneous throughout which isof much importance as an alloy is a mechanical mixture of metals.y lnmelting pots of the prior art it frequently happens that heavier metalsof a mixture of metals will be more or less precipitated from themixture of which they should fully remain av part7 a result which isimpossible with the melting pot of myy invention.

The invention, in accordance with another feature, resides in thecombination of amelting pot with a receiver into which the meltedmaterial may pass from the melting pot, this receiver being in oneintegral structure with the melting pot and having a bottom portionwhich is a continuation of the bottom portion of the melting pot andwhich projects below the melting pot so as to be subject to the samesource of heat which heats the melting pot. With such a structure thematerial in the melting pot need not be raised to as high a temperatureas hitherto, the material in the bottom of the receiver being heated toa higher degree. than that in the pot and. to such a degree as isrequired in a casting operation. Not only do l acquire a very high heatfor melting vthe material in the melting pot but a further advantage issecured in that the material received from the melting pot instead ofhaving its temperature reduced with respect to the material in themelting pot has its temperature increased 1919. Serial No. 307,564.

so' that there is no liability of the material congealing while in thereceptacle.

ln accordance with another feature of the invention the upper portion ofthe receiver is upwardly tapered or downwardly flared to spread air orother inert gas that is used to effect the discharge of the materialfrom the receiver evenly over the top surfaces of such material torender the pressure of the ejecting air uniform thereby eliminatingundesirable currents of air or air and melted material in the receiverso that the material may be discharged from the receiver in a conditionwhich is homogeneous throughout.

ln accordance with another feature of the invention the discharge nozzleof the receiver has its passage outwardly tapered so that the materialin its discharge from thereceiver tends to be compacted rather than tobe rarified whereby it is more cer- 'tainly retained homogeneous in itspassage from the receiver to the molding machine.`

lilitherto it was the practice to continue the walls of the tire box4downwardly to meet the bed which also supported the associated moldingor casting machine. These continuations of the lire box would becomeheated to varying degrees, rendering it diicult to secure properregistry between the discharge end of the nozzle and the receiving orsprue end of the dies. l

ln accordance with another feature of my invention l eliminate thesedownward continuations of the. walls of the lire box and continue thebed of the machine upwardly to be very near the bottom of the tire boxand preferably interpose short distance pieces between the bed of themachine and the bottom of the tire box to prevent heat from radiating tothe bed of the mach-ine. Badiation of heat from the lire box t0 the bedis taining` the bottom of the iire box compara 100 tively coolby airwhich is passed through tho bottom of the fire box to the fire boxinterior7 which air may also be used in maintaining combustion withinthe fire box.

l will explain my invention more fully 105 by reference to theaccompanying drawings showing the preferred embodiment thereof and inwhich Fig. l 1s a view in elevatiom partly broken away, of a part ottthe structure Which includes the 'apparatus of my invention; Fig. 2 is asectional vievv on line 2-2 of Fig. 1; Fig. 3 is a plan view oi thestructure, `4partly broken away', which is shovvn in Fig. 1; Fig. 11 isa sectional view on line 4-4 of Fig. 3; and Fig. 5 is a sectional viewon line 5--5 ot Fig. 1.

The melting apparatus is inclusive of a melting pot 1 which is providedwith a flange 2 also :to constitute a lid' for the fire box?) vthatyi.urnishe's. the heat to melt the metal or metal niiitui'e placedivitliin'the pot as indicatedv at 4 rlllhis bei; in be lined withire'fbriclr. governed means admission of molten material Ina-y occurfrom the melting potlA to the, receiving chamber 5 which is preferablyintegrally formed with or is otherwise constituted a part of the pot andlidI structure 1 2.` This receiver has its bottoni portion preferablyextending belovv theibottorn of the pot to lbe Within the `tire box tobe subject to the heat'thereoif so that t-he metalpas'sing from the potto the receiver vvyill not be cooled but, in tact7 Will be hotterthanthe metal in the pot, the metal raised to the final degree of itsheat Within the'receiver to put it in just the molten condition requiredfor proper casting. The inverted T-shaped passage 6 esv `tablishescommunication Abetween the meltthe. passage would be plugged up bymetal` `lreezing therein the pot structure Would have to bel discarded.Aj

The upright branch or stem of the T- shaped. passage 6; is normallyclosed by-a reciprocable, valve Sguided in its movement ybythe j guide 9projecting laterally from the receiver. Thestem 10 of the valvepivotally dependswfrom the ears 11 at the lower side ofthe lever 12.This lever is fulcrumed7 at f one end, upon the upright 13 carried bythe -rim oi the pot 1 and lis connected at its lother end to theactuatingrod 14 that depends `from the lever.v This rod is connected atitsq lower end with one end of the intermediately pivoted rocker arm 1.5Whose other end ,caru ries a cam roller 16v held in engagement with acam 17 by the spring 18 which presses the rocker arm and thecam rollerthereon toward said cam. A shaft 19 carries the cam 17, the rotation oithis shaft having ksuitable relation to other operations of the 16 andthe valve 8. `When the cam roller is upon the inner segment ot the camfthe valve 8 will be opened, the` relatively duration ol' the open andclosed condition oi' the valves being"` determined by fthe peripherallength's'ofthe outer andfinner segments of said cam. The shaft 19 alsocarries a cam 26 which engaged by a cam roller 21. This cam roller ismounted upon an intermediate portion ofthe arm 22 to which a spring 23is attached to press the arm` upwardly and thereby maintain the engagement of the cam roller 21 with thecam linlr 24% connects .the outer end.of the arm 22 with the arm iiXed upon the stemo the valve 26; This valveis located in a pi ps2? toj prevent or permit thel passageof The body ofmolten metalv that is trated Within the receiver 5 is shown small inquantity in order that the nozzlefpassag'e 29 might more clearlyappear.v INormally the molten .metal Within the receiverhas the sameupper level las'the metal Within 'the melting pot 1.

*compressed air is admitted throughy the pipe `27 for the vpurpose ofeffecting "the ejection or' suflicient metal from the receiver throughthe nozzle vpassage V29 tothe molds which are to define the shapefofthecasting.

rllheupper .portion of the receiver is downwardiy conically flaredtovpermitthe air'to expand afterit 'hasllet lthe pipe sol that it ywillstrike the metalniiitorinly upon the top surface thereoii rather thanina more ydirect and limited stream which would ybe. the case it thereceiver Were not tapered as illustrated. The air thus exertsuniformpressure'M upon the top of thevbeldy otinoltefn,lmet'aly Within thereceiverfto eil'ect the uniorm'c-iicI pulsion of the metal' through lthenozzle passage. The'nozzle passage, in turn7 is tapered romits receivingend. toward .its outlet end whereby the molten metal is morelcoinpressed or compacted at the discharge end f nozzle thev resultbeing that the metal as it enters the molding machineA is preventf` ed`trom being of a spongynature- Any suitablemeans Imay be employedf'orheatingthe metal in the melting; potpth'eVV means illustrated'beinginthe nature oi.r fuel jets `30 adapted to burn oil or Ygas fin thepresence ot the melting plot and the'bottom' portion of the receiverthat projects beloiv lll? ' laterally from the bottom or the lever ofthe melting pot into the fire bei; 3.

The nozzle of the receiver has abutting engagement with the mold or diestructure 'hich ie of a form to suit the casting that is to be made.

@he bottom of the melting pot and the es thereof are to,'etheilcurvilinear in cross section or otherwise formeel so as to tape.:'ownwarft to prevent any metal incmlefl in a neehanical mixture civmetals trein parti ny separating` out from the mixture anel alsoenabling` the more even epplieation ol' the melting' heat to material inthe melting not.

The bed that supports the melting apparatus and which is, alsopreferably an interr-al continua-tion of the be@L that Supports thecasting machine7 is upwardly continued to lie close to the bottom or"the fire box ret to be spaced apart therefrom by a cir-culeting` airspace 32. Short distance pieces are interposed between the bed of tbeapparatus and horizontal ears "t extentii the lire bm. These distancepieces may be in the nature of? washers through which assembly bolts 35are passed7 these bolts passing through the aforesaid ears Sel and ears3G projecting laterally from the supporting bed. The ra -1 diation ofheat from the bottom of the i'ire bei; of the supporting bed is thusreduce to a very low point and is further obstructed by mea-ns of thecooling air passing through the air space 32 into the openings 3'? atthe bottoni of the tire box. The air thus passing -to and through thebottom of the tire bei; into trie interior of this box may also be used,to maintain combustion within the fire box.

llfhile l have herein shown and particuleriy described the preferredVembodiment of my invention l do not Wish to be limited to the preciseiletaiis of construction shown as ehanfges may readily be made Withoutele.- partingw from the spirit or my inventioin but having; thusdescribed invention l. claim as new anel` desire to .secure by LettersPatent the following rllhe combination with a melting pot, ci? areceiver, there being` a passage in the form of 'l' for affordingcommunication between the receiver and the melting pot to enable thereceiver to receive melted material from the melting` pot; a valve foropening and closing the stem. portion of the T-shapecl passage; and aplug at the outer end of the hear portion of the rxEqshaped passage.

ln Witness Whereoil l hereunto subscribe my naine this ninth clay or"May A. D 1919.

FRED. F. SCHRODER.

